Unicode rendering in Tk

I've got one more Tk problem. For reasons that I don't understand,
some "exotic" (non-ASCII) characters render properly some of the time
and are displayed as \uwxyz sequences other times. For instance, I'm
looking at a display right now where in one window I've got a button
labelled with the IPA character for the palatal nasal, properly
rendered, and in a text window of the same program, using the same
font family (Courier) at the same size (14 point) this character is
not rendered; instead, it is displayed as \u0272! What on earth causes
this?

If you want to check it out, I've put a screenshot at:
http://www.cis.upenn.edu/~wjposer/TkUnicode.jpg

Bill

--
Bill Poser, Linguistics, University of Pennsylvania
http://www.ling.upenn.edu/~wjposer/ billposer@xxxxxxxxxxxx
.

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